Chadwick Lake is a reservoir supplying water to the Town of Newburgh, in Orange County, New York, United States, in which it is located.

It is a manmade lake created in 1926 on private property owned by the Chadwick family by damming Quassaick Creek.

In more recent years, its use as a water supply has been supplanted by the Delaware Aqueduct and so Chadwick Lake has reverted to its original function of a recreational facility.

Most of the town's water is supplied today by New York City's Delaware Aqueduct, with the reservoir acting primarily as a backup.

[5] At times, more often than not, the Town of Newburgh has relied exclusively on the Aqueduct since manganese levels in the lake give its waters a brownish tint.

Facilities near the lake's southern end, include picnic shelters, two playgrounds, fitness and walking trails and boating launches.

Opponents of the purchase contended that the Town of Newburgh was still too rural to warrant a central water supply, and the $790,000 price tag was too steep.